The boat operator should judge the speed according to the skiers ability. A good speed for beginners, depending on weight and ski size, is l8 25 miles per hour. Boat speeds are limited by law under certain conditions. The maximum speed for boats is 5 mph within 100 feet of a swimmer, and within 200 feet of a bathing beach frequented by swimmers, a swimming float, a diving platform or life line, or a passenger landing in use. Boats towing skiers must follow an speed limits.